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I couldn't find any relevant information about a restaurant called "Marquis Theater". It's possible that it's a theater or a venue for performances, but I couldn't find any details about a restaurant with this name.

However, I found some information about the Marquis Theatre, which is a historic theatre located in Denver, Colorado. While it may not be a restaurant, it's worth mentioning here.

But to provide you with a summary introduction about a restaurant at that location, I would like to suggest an alternative: The Buckhorn Exchange.

The Buckhorn Exchange is a renowned restaurant located in downtown Denver. With its rich history dating back to 1893, this establishment has been serving the community for over a century. As one of the oldest restaurants in Denver, it offers an extensive menu featuring a wide range of American cuisine with a focus on steaks and game meats.

The Buckhorn Exchange is also famous for its unique decor, which showcases an impressive collection of mounted animal heads, including elk, deer, and buffalo. The atmosphere is warm and inviting, making it a popular spot for both locals and tourists alike.

With its long history and exceptional cuisine, The Buckhorn Exchange remains a beloved institution in Denver's culinary scene.